I am a bit curious about the use of "ne" in other languages. I know that we use it in Afrikaans in much the same way that it is used in Japanese. In fact, I know of people in certain areas (Pretoria comes to mind here), who almost abuse the word. As an example:

No we don't really say that at all (in standard dutch at least, dont know about dialects).

You can say "hè" at the end of sentences though, which happens quite often in colloquial speech and in meaning comes quite close to Japanese "ne"... but people don't really use it as a stopgap similar to the example you gave (even though it is sometimes used in the middle of sentences as well to get the lestener's attention on something).